Process and apparatus for drawing synthetic yarn

ABSTRACT

YARN DRAWING PROCESS WHEREIN THE DRAW POINT IS LOCALIZED BY GRIPPING THE YARN AT THE EXIT POINT OF THE HEATED FEED ROLL. A GRIPPER ROLL PRESSES THE YARN AGAINST THE FEED ROLL AFTER THE YARN HAS BEEN HEATED TO DRAWING TEMPERATURE. THE YARN IS STRETCHED BY A DRAW ROLL ROTATING FASTER THAN THE FEED ROLL. ADDITIONAL HEATING MEANS MAY OPTIONALLY BE USED BETWEEN THE FEED AND DRAW ROLLS TO EFFECT A POST-DRAW HEAT TREATMENT. THE YARN CAN BE PRETENSIONED BEFORE PASSAGE TO THE FEED ROLLS. POLYESTER YARN, E.G. POLYETHYLENE TEREPHTHALATE, CAN BE PROCESSED USING A DRAW RATIO IN EXCESS OF 3X. THE RESULT OF THE PROCESS IS LOCALIZATION OF THE DRAW POINT LEADING TO UNIFORM DRAWING. THE PRODUCT IS THEREFORE UNIFORMLY DYEABLE.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.61. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may he purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oiiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 23, 1971 884a O.G. 1323 T883,020 PROCESS ANDAPPARATUS FOR DRAWING SYNTHETIC YARN Darryl S. Addington, P.0. Box 511,Kingsport, Tenn. 37662 Filed July 24, 1969, Ser. No. 844,436 Int. Cl.D02j 1/22 US. Cl. 264290 1 Sheet Drawing. 16 Pages Specification Yarndrawing process wherein the draw point is localized by gripping the yarnat the exit point of the heated feed roll. A gripper roll presses theyarn against the feed roll after the yarn has been heated to drawingtemperature. The yarn is stretched by a draw roll rotating faster thanthe feed roll. Additional heating means may optionally be used betweenthe feed and draw rolls to effect a postdraw heat treatment. The yarncan be pretensioned before passage to the feed rolls. Polyester yarn,e.g. polyethylene terephthalate, can be processed using a draw ratio inexcess of 3x. The result of the process is localization of the drawpoint leading to uniform drawing. The product is therefore uniformlydyeable.

Feb. 23, 1971 D. s. ADDINGTON PROCESS AND APPARATUS FOR DRAWINGSYNTHETIC YARN Filed July 24, 1969 FIG 5 DARRYL S. ADD/N6 TON INVENTOR.

BY A /V ATTORNEY

